package com.lordjoe.utilities;

/**
 * Base64
 *
 * @author Steve Lewis
 * @date Dec 28, 2010
 */


import org.systemsbiology.xml.*;

/**
 * Encodes and decodes to and from Base64 notation.
 * NOTE - we took this off the web  http://iharder.sourceforge.net/base64/
 * but wish to place it on opur package structure
 * <p>
 * Change Log:
 * </p>
 * <ul>
 * <li>v2.1 - Cleaned up javadoc comments and unused variables and methods. Added
 * some convenience methods for reading and writing to and from files.</li>
 * <li>v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems
 * with other encodings (like EBCDIC).</li>
 * <li>v2.0.1 - Fixed an error when decoding a single byte, that is, when the
 * encoded data was a single byte.</li>
 * <li>v2.0 - I got rid of methods that used booleans to set options.
 * Now everything is more consolidated and cleaner. The code now detects
 * when data that's being decoded is gzip-compressed and will decompress it
 * automatically. Generally things are cleaner. You'll probably have to
 * change some method calls that you were making to support the new
 * options format (<tt>int</tt>s that you "OR" together).</li>
 * <li>v1.5.1 - Fixed bug when decompressing and decoding to a
 * byte[] using <tt>decode( String s, boolean gzipCompressed )</tt>.
 * Added the ability to "suspend" encoding in the Output Stream so
 * you can turn on and off the encoding if you need to embed base64
 * data in an otherwise "normal" stream (like an XML file).</li>
 * <li>v1.5 - Output stream pases on flush() command but doesn't do anything itself.
 * This helps when using GZIP streams.
 * Added the ability to GZip-compress objects before encoding them.</li>
 * <li>v1.4 - Added helper methods to read/write files.</li>
 * <li>v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.</li>
 * <li>v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream
 * where last buffer being read, if not completely full, was not returned.</li>
 * <li>v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.</li>
 * <li>v1.3.3 - Fixed I/O streams which were totally messed up.</li>
 * </ul>
 * <p/>
 * <p>
 * I am placing this code in the Public Domain. Do with it as you will.
 * This software comes with no guarantees or warranties but with
 * plenty of well-wishing instead!
 * Please visit <a href="http://iharder.net/base64">http://iharder.net/base64</a>
 * periodically to check for updates or to contribute improvements.
 * </p>
 *
 * @author Robert Harder
 * @author rob@iharder.net
 * @version 2.1
 */
public class Base64Float {

/* ********  P U B L I C   F I E L D S  ******** */
public static final int FLOAT_SIZE = 4; // bytes per float
public static final int FLOAT64_SIZE = 8; // bytes per float 64


    /**
     * No options specified. Value is zero.
     */
    public final static int NO_OPTIONS = 0;

    /**
     * Specify encoding.
     */
    public final static int ENCODE = 1;


    /**
     * Specify decoding.
     */
    @SuppressWarnings("UnusedDeclaration")
    public final static int DECODE = 0;


    /**
     * Specify that data should be gzip-compressed.
     */
    @SuppressWarnings("UnusedDeclaration")
    public final static int GZIP = 2;


    /**
     * dont break lines when encoding (violates strict Base64 specification)
     */
    public final static int DONT_BREAK_LINES = 8;


/* ********  P R I V A T E   F I E L D S  ******** */


    /**
     * Maximum line length (76) of Base64 output.
     */
    private final static int MAX_LINE_LENGTH = 76;


    /**
     * The equals sign (=) as a byte.
     */
    private final static byte EQUALS_SIGN = (byte) '=';


    /**
     * The new line character (\n) as a byte.
     */
    private final static byte NEW_LINE = (byte) '\n';


    /**
     * Preferred encoding.
     */
    private final static String PREFERRED_ENCODING = "UTF-8";


    /**
     * The 64 valid Base64 values.
     */
    private final static byte[] ALPHABET;
    private final static byte[] _NATIVE_ALPHABET = /* May be something funny like EBCDIC */
            {
                    (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G',
                    (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N',
                    (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U',
                    (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z',
                    (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g',
                    (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n',
                    (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u',
                    (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z',
                    (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5',
                    (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '+', (byte) '/'
            };

    /** Determine which ALPHABET to use. */
    static {
        byte[] __bytes;
        try {
            __bytes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".getBytes(PREFERRED_ENCODING);
        }   // end try
        catch (java.io.UnsupportedEncodingException use) {
            __bytes = _NATIVE_ALPHABET; // Fall back to native encoding
        }   // end catch
        ALPHABET = __bytes;
    }   // end static


    /**
     * Translates a Base64 value to either its 6-bit reconstruction value
     * or a negative number indicating some other meaning.
     */
    private final static byte[] DECODABET =
            {
                    -9, -9, -9, -9, -9, -9, -9, -9, -9,                 // Decimal  0 -  8
                    -5, -5,                                      // Whitespace: Tab and Linefeed
                    -9, -9,                                      // Decimal 11 - 12
                    -5,                                         // Whitespace: Carriage Return
                    -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,     // Decimal 14 - 26
                    -9, -9, -9, -9, -9,                             // Decimal 27 - 31
                    -5,                                         // Whitespace: Space
                    -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,              // Decimal 33 - 42
                    62,                                         // Plus sign at decimal 43
                    -9, -9, -9,                                   // Decimal 44 - 46
                    63,                                         // Slash at decimal 47
                    52, 53, 54, 55, 56, 57, 58, 59, 60, 61,              // Numbers zero through nine
                    -9, -9, -9,                                   // Decimal 58 - 60
                    -1,                                         // Equals sign at decimal 61
                    -9, -9, -9,                                      // Decimal 62 - 64
                    0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,            // Letters 'A' through 'N'
                    14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,        // Letters 'O' through 'Z'
                    -9, -9, -9, -9, -9, -9,                          // Decimal 91 - 96
                    26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,     // Letters 'a' through 'm'
                    39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,     // Letters 'n' through 'z'
                    -9, -9, -9, -9                                 // Decimal 123 - 126
                    /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 127 - 139
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 140 - 152
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 153 - 165
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 166 - 178
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 179 - 191
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 192 - 204
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 205 - 217
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 218 - 230
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,     // Decimal 231 - 243
      -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9         // Decimal 244 - 255 */
            };

    // I think I end up not using the BAD_ENCODING indicator.
    //private final static byte BAD_ENCODING    = -9; // Indicates error in encoding
    private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding
    private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding



    public static void floatToBytes(float f, byte[] data, int start) {
        int value = Float.floatToIntBits(f);
        data[start + 3] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 2] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 1] = (byte) (value & 0xff);
        value >>= 8;
        //noinspection PointlessArithmeticExpression
        data[start + 0] = (byte) (value & 0xff);
    }


    public static void float64ToBytes(double d, byte[] data, int start) {
        long value = Double.doubleToLongBits(d);
        data[start + 7] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 6] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 5] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 4] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 3] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 2] = (byte) (value & 0xff);
        value >>= 8;
        data[start + 1] = (byte) (value & 0xff);
        value >>= 8;
        //noinspection PointlessArithmeticExpression
        data[start + 0] = (byte) (value & 0xff);

    }

    /**
     * Defeats instantiation.
     */
    private Base64Float() {
    }


/* ********  E N C O D I N G   M E T H O D S  ******** */


    /**
     * Encodes up to the first three bytes of array <var>threeBytes</var>
     * and returns a four-byte array in Base64 notation.
     * The actual number of significant bytes in your array is
     * given by <var>numSigBytes</var>.
     * The array <var>threeBytes</var> needs only be as big as
     * <var>numSigBytes</var>.
     * Code can reuse a byte array by passing a four-byte array as <var>b4</var>.
     *
     * @param b4          A reusable byte array to reduce array instantiation
     * @param threeBytes  the array to convert
     * @param numSigBytes the number of significant bytes in your array
     * @return four byte array in Base64 notation.
     * @since 1.5.1
     */
    private static byte[] encode3to4(byte[] b4, byte[] threeBytes, int numSigBytes) {
        encode3to4(threeBytes, 0, numSigBytes, b4, 0);
        return b4;
    }   // end encode3to4


    /**
     * Encodes up to three bytes of the array <var>source</var>
     * and writes the resulting four Base64 bytes to <var>destination</var>.
     * The source and destination arrays can be manipulated
     * anywhere along their length by specifying
     * <var>srcOffset</var> and <var>destOffset</var>.
     * This method does not check to make sure your arrays
     * are large enough to accomodate <var>srcOffset</var> + 3 for
     * the <var>source</var> array or <var>destOffset</var> + 4 for
     * the <var>destination</var> array.
     * The actual number of significant bytes in your array is
     * given by <var>numSigBytes</var>.
     *
     * @param source      the array to convert
     * @param srcOffset   the index where conversion begins
     * @param numSigBytes the number of significant bytes in your array
     * @param destination the array to hold the conversion
     * @param destOffset  the index where output will be put
     * @return the <var>destination</var> array
     * @since 1.3
     */
    private static byte[] encode3to4(
            byte[] source, int srcOffset, int numSigBytes,
            byte[] destination, int destOffset) {
        //           1         2         3
        // 01234567890123456789012345678901 Bit position
        // --------000000001111111122222222 Array position from threeBytes
        // --------|    ||    ||    ||    | Six bit groups to index ALPHABET
        //          >>18  >>12  >> 6  >> 0  Right shift necessary
        //                0x3f  0x3f  0x3f  Additional AND

        // Create buffer with zero-padding if there are only one or two
        // significant bytes passed in the array.
        // We have to shift left 24 in order to flush out the 1's that appear
        // when Java treats a value as negative that is cast from a byte to an int.
        int inBuff = (numSigBytes > 0 ? ((source[srcOffset] << 24) >>> 8) : 0)
                | (numSigBytes > 1 ? ((source[srcOffset + 1] << 24) >>> 16) : 0)
                | (numSigBytes > 2 ? ((source[srcOffset + 2] << 24) >>> 24) : 0);

        switch (numSigBytes) {
            case 3:
                destination[destOffset] = ALPHABET[(inBuff >>> 18)];
                destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
                destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f];
                destination[destOffset + 3] = ALPHABET[(inBuff) & 0x3f];
                return destination;

            case 2:
                destination[destOffset] = ALPHABET[(inBuff >>> 18)];
                destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
                destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f];
                destination[destOffset + 3] = EQUALS_SIGN;
                return destination;

            case 1:
                destination[destOffset] = ALPHABET[(inBuff >>> 18)];
                destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
                destination[destOffset + 2] = EQUALS_SIGN;
                destination[destOffset + 3] = EQUALS_SIGN;
                return destination;

            default:
                return destination;
        }   // end switch
    }   // end encode3to4


//    /**
//     * Serializes an object and returns the Base64-encoded
//     * version of that serialized object. If the object
//     * cannot be serialized or there is another error,
//     * the method will return <tt>null</tt>.
//     * The object is not GZip-compressed before being encoded.
//     *
//     * @param serializableObject The object to encode
//     * @return The Base64-encoded object
//     * @since 1.4
//     */
//    public static String encodeObject( java.io.Serializable serializableObject )
//    {
//        return encodeObject( serializableObject, NO_OPTIONS );
//    }   // end encodeObject
//
//
//
//    /**
//     * Serializes an object and returns the Base64-encoded
//     * version of that serialized object. If the object
//     * cannot be serialized or there is another error,
//     * the method will return <tt>null</tt>.
//     * <p>
//     * Valid options:<pre>
//     *   GZIP: gzip-compresses object before encoding it.
//     *   DONT_BREAK_LINES: dont break lines at 76 characters
//     *     <i>Note: Technically, this makes your encoding non-compliant.</i>
//     * </pre>
//     * <p>
//     * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or
//     * <p>
//     * Example: <code>encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES )</code>
//     *
//     * @param serializableObject The object to encode
//     * @param options Specified options
//     * @return The Base64-encoded object
//     * @see Base64#GZIP
//     * @see Base64#DONT_BREAK_LINES
//     * @since 2.0
//     */
//    public static String encodeObject( java.io.Serializable serializableObject, int options )
//    {
//        // Streams
//        java.io.ByteArrayOutputStream  baos  = null;
//        java.io.OutputStream           b64os = null;
//        java.io.ObjectOutputStream     oos   = null;
//        java.util.zip.GZIPOutputStream gzos  = null;
//
//        // Isolate options
//        int gzip           = (options & GZIP);
//        int dontBreakLines = (options & DONT_BREAK_LINES);
//
//        try
//        {
//            // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream
//            baos  = new java.io.ByteArrayOutputStream();
//            b64os = new OutputStream( baos, ENCODE | dontBreakLines );
//
//            // GZip?
//            if( gzip == GZIP )
//            {
//                gzos = new java.util.zip.GZIPOutputStream( b64os );
//                oos  = new java.io.ObjectOutputStream( gzos );
//            }   // end if: gzip
//            else
//                oos   = new java.io.ObjectOutputStream( b64os );
//
//            oos.writeObject( serializableObject );
//        }   // end try
//        catch( java.io.IOException e )
//        {
//            e.printStackTrace();
//            return null;
//        }   // end catch
//        finally
//        {
//            try{ oos.close();   } catch( Exception e ){}
//            try{ gzos.close();  } catch( Exception e ){}
//            try{ b64os.close(); } catch( Exception e ){}
//            try{ baos.close();  } catch( Exception e ){}
//        }   // end finally
//
//        // Return value according to relevant encoding.
//        try
//        {
//            return new String( baos.toByteArray(), PREFERRED_ENCODING );
//        }   // end try
//        catch (java.io.UnsupportedEncodingException uue)
//        {
//            return new String( baos.toByteArray() );
//        }   // end catch
//
//    }   // end encode
//
//

    /**
     * Encodes a byte array into Base64 notation.
     * Does not GZip-compress data.
     *
     * @param source The data to convert
     * @since 1.4
     */
    @SuppressWarnings("UnusedDeclaration")
    public static byte[] encodeBytes(byte[] source) {
        return encodeBytes(source, 0, source.length, NO_OPTIONS);
    }   // end encodeBytes

    /**
     * Encodes a byte array into Base64 notation.
     * Does not GZip-compress data.
     *
     * @param source The data to convert
     * @since 1.4
     */
    public static String encodeBytesAsString(byte[] source, int options) {
        byte[] outBuff = encodeBytes(source, 0, source.length, options);
        int end = outBuff.length;
        while (end > 0 && outBuff[end - 1] == 0)
            end--;
        // Return value according to relevant encoding.
        try {
            return new String(outBuff, 0, end, PREFERRED_ENCODING);
        }   // end try
        catch (java.io.UnsupportedEncodingException uue) {
            return new String(outBuff, 0, outBuff.length);
        }   // end catch
    }

    /**
     * Encodes a byte array into Base64 notation.
     * Does not GZip-compress data.
     *
     * @param source The data to convert
     * @since 1.4
     */
    public static String encodeBytesAsString(byte[] source) {
        return encodeBytesAsString(source, ENCODE | DONT_BREAK_LINES);
    }

    /**
     * Encodes a float array into Base64 notation.
     * Does not GZip-compress data.
     *
     * @param source The data to convert
     * @since 1.4
     */
    public static String encodeFloatsAsString(float[] data) {
        byte[] bytes = new byte[data.length * FLOAT_SIZE];
        int index = 0;
        //noinspection ForLoopReplaceableByForEach
        for (int i = 0; i < data.length; i++) {
            float v = data[i];
            floatToBytes(v, bytes, index);
            index += FLOAT_SIZE;

        }
        //noinspection UnnecessaryLocalVariable,UnusedDeclaration,UnusedAssignment
        String s = encodeBytesAsString(bytes, ENCODE | DONT_BREAK_LINES);
        return s;
    }


    /**
     * Encodes a double array into Base64 notation.
     * Does not GZip-compress data.
     *
     * @param source The data to convert
     * @since 1.4
     */
    @SuppressWarnings("UnusedDeclaration")
    public static String encodeDoublesAsString(double[] data) {
        byte[] bytes = new byte[data.length * FLOAT64_SIZE];
        int index = 0;
        //noinspection ForLoopReplaceableByForEach
        for (int i = 0; i < data.length; i++) {
            double v = data[i];
            float64ToBytes(v, bytes, index);
            index += FLOAT64_SIZE;

        }
        String s = encodeBytesAsString(bytes, ENCODE | DONT_BREAK_LINES);
        s = s.trim();
        return s;
    }



    /**
     * Encodes a byte array into Base64 notation.
     * <p/>
     * Valid options:<pre>
     *   GZIP: gzip-compresses object before encoding it.
     *   DONT_BREAK_LINES: dont break lines at 76 characters
     *     <i>Note: Technically, this makes your encoding non-compliant.</i>
     * </pre>
     * <p/>
     * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or
     * <p/>
     * Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code>
     *
     * @param source  The data to convert
     * @param off     Offset in array where conversion should begin
     * @param len     Length of data to convert
     * @param options Specified options
     * @see Base64#GZIP
     * @see Base64#DONT_BREAK_LINES
     * @since 2.0
     */
    public static byte[] encodeBytes(byte[] source, int off, int len, int options) {
        // Isolate options
        int dontBreakLines = (options & DONT_BREAK_LINES);
         // Convert option to boolean in way that code likes it.
        boolean breakLines = dontBreakLines == 0;

        int len43 = len * 4 / 3;
        byte[] outBuff = new byte[(len43)                      // Main 4:3
                + ((len % 3) > 0 ? 4 : 0)      // Account for padding
                + (breakLines ? (len43 / MAX_LINE_LENGTH) : 0)]; // New lines
        int d = 0;
        int e = 0;
        int len2 = len - 2;
        int lineLength = 0;
        for (; d < len2; d += 3, e += 4) {
            encode3to4(source, d + off, 3, outBuff, e);

            lineLength += 4;
            if (breakLines && lineLength == MAX_LINE_LENGTH) {
                outBuff[e + 4] = NEW_LINE;
                e++;
                lineLength = 0;
            }   // end if: end of line
        }   // en dfor: each piece of array

        if (d < len) {
            encode3to4(source, d + off, len - d, outBuff, e);
            e += 4;
        }   // end if: some padding needed

        return outBuff;


        //       }   // end else: dont compress

    }   // end encodeBytes


/* ********  D E C O D I N G   M E T H O D S  ******** */


    /**
     * Decodes four bytes from array <var>source</var>
     * and writes the resulting bytes (up to three of them)
     * to <var>destination</var>.
     * The source and destination arrays can be manipulated
     * anywhere along their length by specifying
     * <var>srcOffset</var> and <var>destOffset</var>.
     * This method does not check to make sure your arrays
     * are large enough to accomodate <var>srcOffset</var> + 4 for
     * the <var>source</var> array or <var>destOffset</var> + 3 for
     * the <var>destination</var> array.
     * This method returns the actual number of bytes that
     * were converted from the Base64 encoding.
     *
     * @param source      the array to convert
     * @param srcOffset   the index where conversion begins
     * @param destination the array to hold the conversion
     * @param destOffset  the index where output will be put
     * @return the number of decoded bytes converted
     * @since 1.3
     */
    private static int decode4to3(byte[] source, int srcOffset, byte[] destination, int destOffset) {
        // Example: Dk==
        if (source[srcOffset + 2] == EQUALS_SIGN) {
            // Two ways to do the same thing. dont know which way I like best.
            //int outBuff =   ( ( DECODABET[ source[ srcOffset    ] ] << 24 ) >>>  6 )
            //              | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 );
            int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
                    | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12);

            destination[destOffset] = (byte) (outBuff >>> 16);
            return 1;
        }

        // Example: DkL=
        else if (source[srcOffset + 3] == EQUALS_SIGN) {
            // Two ways to do the same thing. dont know which way I like best.
            //int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 )
            //              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
            //              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 );
            int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
                    | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12)
                    | ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6);

            destination[destOffset] = (byte) (outBuff >>> 16);
            destination[destOffset + 1] = (byte) (outBuff >>> 8);
            return 2;
        }

        // Example: DkLE
        else {
            try {
                // Two ways to do the same thing. dont know which way I like best.
                //int outBuff =   ( ( DECODABET[ source[ srcOffset     ] ] << 24 ) >>>  6 )
                //              | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 )
                //              | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 )
                //              | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 );
                int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18)
                        | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12)
                        | ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6)
                        | ((DECODABET[source[srcOffset + 3]] & 0xFF));


                destination[destOffset] = (byte) (outBuff >> 16);
                destination[destOffset + 1] = (byte) (outBuff >> 8);
                destination[destOffset + 2] = (byte) (outBuff);

                return 3;
            }
            catch (Exception e) {
                XMLUtilities.outputLine("" + source[srcOffset] + ": " + (DECODABET[source[srcOffset]]));
                XMLUtilities.outputLine("" + source[srcOffset + 1] + ": " + (DECODABET[source[srcOffset + 1]]));
                XMLUtilities.outputLine("" + source[srcOffset + 2] + ": " + (DECODABET[source[srcOffset + 2]]));
                XMLUtilities.outputLine("" + source[srcOffset + 3] + ": " + (DECODABET[source[srcOffset + 3]]));
                return -1;
            }   //e nd catch
        }
    }   // end decodeToBytes


    /**
     * Very low-level access to decoding ASCII characters in
     * the form of a byte array. Does not support automatically
     * gunzipping or any other "fancy" features.
     *
     * @param source The Base64 encoded data
     * @param off    The offset of where to begin decoding
     * @param len    The length of characters to decode
     * @return decoded data
     * @since 1.3
     */
    public static byte[] decode(byte[] source, int off, int len) {
        int len34 = len * 3 / 4;
        byte[] outBuff = new byte[len34]; // Upper limit on size of output
        int outBuffPosn = 0;

        byte[] b4 = new byte[4];
        int b4Posn = 0;
        int i;
        byte sbiCrop;
        byte sbiDecode;
        for (i = off; i < off + len; i++) {
            sbiCrop = (byte) (source[i] & 0x7f); // Only the low seven bits
            sbiDecode = DECODABET[sbiCrop];

            if (sbiDecode >= WHITE_SPACE_ENC) // White space, Equals sign or better
            {
                if (sbiDecode >= EQUALS_SIGN_ENC) {
                    b4[b4Posn++] = sbiCrop;
                    if (b4Posn > 3) {
                        outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn);
                        b4Posn = 0;

                        // If that was the equals sign, break out of 'for' loop
                        if (sbiCrop == EQUALS_SIGN)
                            break;
                    }   // end if: quartet built

                }   // end if: equals sign or better

            }   // end if: white space, equals sign or better
            else {
                System.err.println("Bad Base64 input character at " + i + ": " + source[i] + "(decimal)");
                return null;
            }   // end else:
        }   // each input character

        byte[] out = new byte[outBuffPosn];
        System.arraycopy(outBuff, 0, out, 0, outBuffPosn);
        return out;
    }   // end decode

    /**
     * return the resulta of decoding a base64 string as an array of floats
     * @param base64
     * @return
     */
    public static float[] decodeFloats(String base64)
    {
        if(base64.length() == 0)
            return new float[0];

        byte[] decoded =  decode(base64);
         int npeaks = decoded.length /  FLOAT_SIZE;

         float[] ret = new float[npeaks];
         for (int i = 0; i < decoded.length; i +=   FLOAT_SIZE ) {
             ret[i / FLOAT_SIZE ] = bytesToFloat(decoded, i);

         }
        return ret;

    }


    public static float bytesToFloat(byte[] data, int start) {
        int b1 = data[start];
        int b2 = data[start + 1];
        int b3 = data[start + 2];
        int b4 = data[start + 3];
        int value = ((b1 << 24) & 0xff000000) + ((b2 << 16) & 0xff0000) + ((b3 << 8) & 0xff00) + (b4 & 0xff);
        //noinspection UnnecessaryLocalVariable
        float f1 = Float.intBitsToFloat(value);
        return f1;
    }

    public static double bytesToFloat64(byte[] data, int start) {
        int b1 = data[start];
        int b2 = data[start + 1];
        int b3 = data[start + 2];
        int b4 = data[start + 3];
        int b5 = data[start + 4];
        int b6 = data[start + 5];
        int b7 = data[start + 6];
        int b8 = data[start + 7];

        long value = ((b1 & 0xffL) << 56);
        value += ((b2 & 0xffL) << 48);
        value += ((b3 & 0xffL) << 40);
        value += ((b4 & 0xffL) << 32);
        value += ((b5 & 0xffL) << 24);
        value += ((b6 & 0xffL) << 16);
        value += ((b7 & 0xffL) << 8);
        value += ((b8 & 0xffL));

        //noinspection UnnecessaryLocalVariable
        double f1 = Double.longBitsToDouble(value);
        return f1;
    }

    /**
     * Decodes data from Base64 notation, automatically
     * detecting gzip-compressed data and decompressing it.
     *
     * @param s the string to decode
     * @return the decoded data
     * @since 1.4
     */
    public static byte[] decode(String s) {
        byte[] bytes;
        try {
            bytes = s.getBytes(PREFERRED_ENCODING);
        }   // end try
        catch (java.io.UnsupportedEncodingException uee) {
            bytes = s.getBytes();
        }   // end catch
        //</change>

        // Decode
        bytes = decode(bytes, 0, bytes.length);


        // Check to see if it's gzip-compressed
        // GZIP Magic Two-Byte Number: 0x8b1f (35615)
        if (bytes != null && bytes.length >= 4) {

            //noinspection UnusedDeclaration
            int head = ((int) bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);
//            if( java.util.zip.GZIPInputStream.GZIP_MAGIC == head )
//            {
//                java.io.ByteArrayInputStream  bais = null;
//                java.util.zip.GZIPInputStream gzis = null;
//                java.io.ByteArrayOutputStream baos = null;
//                byte[] buffer = new byte[2048];
//                int    length = 0;
//
//                try
//                {
//                    baos = new java.io.ByteArrayOutputStream();
//                    bais = new java.io.ByteArrayInputStream( bytes );
//                    gzis = new java.util.zip.GZIPInputStream( bais );
//
//                    while( ( length = gzis.read( buffer ) ) >= 0 )
//                    {
//                        baos.write(buffer,0,length);
//                    }   // end while: reading input
//
//                    // No error? Get new bytes.
//                    bytes = baos.toByteArray();
//
//                }   // end try
//                catch( java.io.IOException e )
//                {
//                    // Just return originally-decoded bytes
//                }   // end catch
//                finally
//                {
//                    try{ baos.close(); } catch( Exception e ){}
//                    try{ gzis.close(); } catch( Exception e ){}
//                    try{ bais.close(); } catch( Exception e ){}
//                }   // end finally
//
//            }   // end if: gzipped
        }   // end if: bytes.length >= 2

        return bytes;
    }   // end decode




    /* ********  I N N E R   C L A S S   O U T P U T S T R E A M  ******** */


    /**
     * A {@link .Base64.OutputStream} will write data to another
     * <tt>java.io.OutputStream</tt>, given in the constructor,
     * and encode/decode to/from Base64 notation on the fly.
     *
     * @see Base64
     * @since 1.3
     */
    public static class OutputStream extends java.io.FilterOutputStream {
        private boolean encode;
        private int position;
        private byte[] buffer;
        private int bufferLength;
        private int lineLength;
        private boolean breakLines;
        private byte[] b4; // Scratch used in a few places
        private boolean suspendEncoding;

        /**
         * Constructs a {@link .Base64.OutputStream} in ENCODE mode.
         *
         * @param out the <tt>java.io.OutputStream</tt> to which data will be written.
         * @since 1.3
         */
        public OutputStream(java.io.OutputStream out) {
            this(out, ENCODE);
        }   // end constructor


        /**
         * Constructs a {@link .Base64.OutputStream} in
         * either ENCODE or DECODE mode.
         * <p/>
         * Valid options:<pre>
         *   ENCODE or DECODE: Encode or Decode as data is read.
         *   DONT_BREAK_LINES: dont break lines at 76 characters
         *     (only meaningful when encoding)
         *     <i>Note: Technically, this makes your encoding non-compliant.</i>
         * </pre>
         * <p/>
         * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code>
         *
         * @param out     the <tt>java.io.OutputStream</tt> to which data will be written.
         * @param options Specified options.
         * @see Base64#ENCODE
         * @see Base64#DECODE
         * @see Base64#DONT_BREAK_LINES
         * @since 1.3
         */
        public OutputStream(java.io.OutputStream out, int options) {
            super(out);
            this.breakLines = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES;
            this.encode = (options & ENCODE) == ENCODE;
            this.bufferLength = encode ? 3 : 4;
            this.buffer = new byte[bufferLength];
            this.position = 0;
            this.lineLength = 0;
            this.suspendEncoding = false;
            this.b4 = new byte[4];
        }   // end constructor


        /**
         * Writes the byte to the output stream after
         * converting to/from Base64 notation.
         * When encoding, bytes are buffered three
         * at a time before the output stream actually
         * gets a write() call.
         * When decoding, bytes are buffered four
         * at a time.
         *
         * @param theByte the byte to write
         * @since 1.3
         */
        public void write(int theByte) throws java.io.IOException {
            // Encoding suspended?
            if (suspendEncoding) {
                super.out.write(theByte);
                return;
            }   // end if: supsended

            // Encode?
            if (encode) {
                buffer[position++] = (byte) theByte;
                if (position >= bufferLength)  // Enough to encode.
                {
                    out.write(encode3to4(b4, buffer, bufferLength));

                    lineLength += 4;
                    if (breakLines && lineLength >= MAX_LINE_LENGTH) {
                        out.write(NEW_LINE);
                        lineLength = 0;
                    }   // end if: end of line

                    position = 0;
                }   // end if: enough to output
            }   // end if: encoding

            // Else, Decoding
            else {
                // Meaningful Base64 character?
                if (DECODABET[theByte & 0x7f] > WHITE_SPACE_ENC) {
                    buffer[position++] = (byte) theByte;
                    if (position >= bufferLength)  // Enough to output.
                    {
                        int len = Base64Float.decode4to3(buffer, 0, b4, 0);
                        out.write(b4, 0, len);
                        //out.write( Base64.decode4to3( buffer ) );
                        position = 0;
                    }   // end if: enough to output
                }   // end if: meaningful base64 character
                else if (DECODABET[theByte & 0x7f] != WHITE_SPACE_ENC) {
                    throw new java.io.IOException("Invalid character in Base64 data.");
                }   // end else: not white space either
            }   // end else: decoding
        }   // end write


        /**
         * Calls {@link #write(int)} repeatedly until <var>len</var>
         * bytes are written.
         *
         * @param theBytes array from which to read bytes
         * @param off      offset for array
         * @param len      max number of bytes to read into array
         * @since 1.3
         */
        public void write(byte[] theBytes, int off, int len) throws java.io.IOException {
            // Encoding suspended?
            if (suspendEncoding) {
                super.out.write(theBytes, off, len);
                return;
            }   // end if: supsended

            for (int i = 0; i < len; i++) {
                write(theBytes[off + i]);
            }   // end for: each byte written

        }   // end write


        /**
         * Method added by PHIL. [Thanks, PHIL. -Rob]
         * This pads the buffer without closing the stream.
         */
        public void flushBase64() throws java.io.IOException {
            if (position > 0) {
                if (encode) {
                    out.write(encode3to4(b4, buffer, position));
                    position = 0;
                }   // end if: encoding
                else {
                    throw new java.io.IOException("Base64 input not properly padded.");
                }   // end else: decoding
            }   // end if: buffer partially full

        }   // end flush


        /**
         * Flushes and closes (I think, in the superclass) the stream.
         *
         * @since 1.3
         */
        public void close() throws java.io.IOException {
            // 1. Ensure that pending characters are written
            flushBase64();

            // 2. Actually close the stream
            // Base class both flushes and closes.
            super.close();

            buffer = null;
            out = null;
        }   // end close




    }   // end inner class OutputStream


}   // end class Base64
